Group Theory Solutions: #9
9.* (1993 1 1) Allene (1,2-propadiene) has the formula C3H4 and consists of three carbon atoms connected by double bonds and two pairs of terminal H atoms: CH2=C=CH2.
A. Draw a picture looking down the C-C-C axis showing the orientation of the two filled pi orbitals.
B. Are the two CH2 planes parallel or perpedicular to one another?
perpendicular
C. Name each symmetry element present for allene. Name each element as many times as different kinds of the same type exist in the molecule, e.g. if there are two different (noncoinciding) C2 rotation axes, name C2 twice. Do not guess; wrong answers will be subtracted from right answers.
Allene has E, S1, 3C2, and S4.
D. What is the formal charge on the central carbon atom in allene?
Missian Shadrack
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Muhammad Shuaib
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